Decided to make a video about this to share my own personal experience with PSN. I've been toying with the idea for a while, you're welcome to post your own video of your experience with Steam/PSN/XBL.
Just a link because I'm not sure how to embed.
For those too lazy to open, I have a 250m/bit down & 100m/bit up connection from Comcast. I regularly am maxing my connection out on PSN (and beyond) and the only time I see any kind of hit taken is when downloading multiple things or when I have Spotify running in the background.
Parts of the video you can see that it's pushing data to me faster than what Comcast advertises. At some points the game is downloaded in 30 MegaBYTE chunks.